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1e9ea7e044
This reverts commit 7ffa8f3d30.
Reverts the removal of the classic read-only ntfs driver to
serve as the base for a new read-write ntfs implementation.
If we stack changes on top of the revert patch, It will significantly
reduce the diff size, making the review easier.
This revert intentionally excludes the restoration of Kconfig and
Makefile. The Kconfig and Makefile will be added back in the final patch
of this series, enabling the driver only after all features and
improvements have been applied.
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* mft.h - Defines for mft record handling in NTFS Linux kernel driver.
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* Part of the Linux-NTFS project.
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*
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* Copyright (c) 2001-2004 Anton Altaparmakov
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*/
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#ifndef _LINUX_NTFS_MFT_H
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#define _LINUX_NTFS_MFT_H
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#include <linux/fs.h>
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#include <linux/highmem.h>
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#include <linux/pagemap.h>
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#include "inode.h"
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extern MFT_RECORD *map_mft_record(ntfs_inode *ni);
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extern void unmap_mft_record(ntfs_inode *ni);
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extern MFT_RECORD *map_extent_mft_record(ntfs_inode *base_ni, MFT_REF mref,
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ntfs_inode **ntfs_ino);
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static inline void unmap_extent_mft_record(ntfs_inode *ni)
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{
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unmap_mft_record(ni);
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return;
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}
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#ifdef NTFS_RW
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/**
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* flush_dcache_mft_record_page - flush_dcache_page() for mft records
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* @ni: ntfs inode structure of mft record
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*
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* Call flush_dcache_page() for the page in which an mft record resides.
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*
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* This must be called every time an mft record is modified, just after the
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* modification.
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*/
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static inline void flush_dcache_mft_record_page(ntfs_inode *ni)
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{
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flush_dcache_page(ni->page);
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}
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extern void __mark_mft_record_dirty(ntfs_inode *ni);
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/**
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* mark_mft_record_dirty - set the mft record and the page containing it dirty
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* @ni: ntfs inode describing the mapped mft record
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*
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* Set the mapped (extent) mft record of the (base or extent) ntfs inode @ni,
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* as well as the page containing the mft record, dirty. Also, mark the base
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* vfs inode dirty. This ensures that any changes to the mft record are
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* written out to disk.
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*
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* NOTE: Do not do anything if the mft record is already marked dirty.
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*/
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static inline void mark_mft_record_dirty(ntfs_inode *ni)
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{
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if (!NInoTestSetDirty(ni))
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__mark_mft_record_dirty(ni);
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}
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extern int ntfs_sync_mft_mirror(ntfs_volume *vol, const unsigned long mft_no,
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MFT_RECORD *m, int sync);
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extern int write_mft_record_nolock(ntfs_inode *ni, MFT_RECORD *m, int sync);
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/**
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* write_mft_record - write out a mapped (extent) mft record
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* @ni: ntfs inode describing the mapped (extent) mft record
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* @m: mapped (extent) mft record to write
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* @sync: if true, wait for i/o completion
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*
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* This is just a wrapper for write_mft_record_nolock() (see mft.c), which
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* locks the page for the duration of the write. This ensures that there are
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* no race conditions between writing the mft record via the dirty inode code
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* paths and via the page cache write back code paths or between writing
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* neighbouring mft records residing in the same page.
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*
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* Locking the page also serializes us against ->read_folio() if the page is not
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* uptodate.
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*
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* On success, clean the mft record and return 0. On error, leave the mft
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* record dirty and return -errno.
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*/
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static inline int write_mft_record(ntfs_inode *ni, MFT_RECORD *m, int sync)
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{
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struct page *page = ni->page;
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int err;
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BUG_ON(!page);
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lock_page(page);
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err = write_mft_record_nolock(ni, m, sync);
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unlock_page(page);
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return err;
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}
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extern bool ntfs_may_write_mft_record(ntfs_volume *vol,
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const unsigned long mft_no, const MFT_RECORD *m,
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ntfs_inode **locked_ni);
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extern ntfs_inode *ntfs_mft_record_alloc(ntfs_volume *vol, const int mode,
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ntfs_inode *base_ni, MFT_RECORD **mrec);
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extern int ntfs_extent_mft_record_free(ntfs_inode *ni, MFT_RECORD *m);
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#endif /* NTFS_RW */
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#endif /* _LINUX_NTFS_MFT_H */
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